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Label Element Value
[RiskReturnAbstract] rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2013
Registrant Name dei_EntityRegistrantName Eaton Vance Mutual Funds Trust
Central Index Key dei_EntityCentralIndexKey 0000745463
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jun. 10, 2014
Document Effective Date dei_DocumentEffectiveDate Jun. 10, 2014
Prospectus Date rr_ProspectusDate May 01, 2014
Parametric Commodity Strategy Fund
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Supplement [Text Block] evmft_SupplementTextBlock

PARAMETRIC ABSOLUTE RETURN FUND
PARAMETRIC COMMODITY STRATEGY FUND

Supplement to Prospectus dated May 1, 2014

1. The following replaces the sentence on the front cover under “Parametric Commodity Strategy Fund”:

A diversified fund seeking total return

2. The following paragraph is deleted under “Principal Investment Strategies” in “Fund Summaries – Parametric Commodity Strategy Fund”:

Issuer Diversification Risk. The Fund is “non-diversified,” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.” Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

 

   
June 10, 2014 15182 6.10.14

 
Parametric Commodity Strategy Fund | Institutional Class
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EIPCX
Parametric Commodity Strategy Fund | Investor Class
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EAPCX